title: Degree of conversion and hardness of two different systems of the Vitrebond™ glass ionomer cement light cured with blue LED.
abstract: This study investigated the physicochemical properties of the new formulation of the glass ionomer cements through hardness test and degree of conversion by infrared spectroscopy (FTIR). Forty specimens (n = 40) were made in a metallic mold (4 mm diameter x 2 mm thickness) with two resin-modified glass ionomer cements, Vitrebond™ and Vitrebond™ Plus (3M/ ESPE). Each specimen was light cured with blue LED with power density of 500 mW/cm(2) during 30 s. Immediately after light curing, 24h, 48h and 7 days the hardness and degree of conversion was determined. The Vickers hardness was performed by the MMT-3 microhardness tester using load of 50 gm force for 30 seconds. For degree of conversion, the specimens were pulverized, pressed with KBr and analyzed with FT-IR (Nexus 470). The statistical analysis of the data by ANOVA showed that the Vitrebond™ and Vitrebond™ Plus were no difference significant between the same storage times (p > 0.05). For degree of conversion, the Vitrebond™ and Vitrebond™ Plus were statistically different in all storage times after light curing. The Vitrebond™ showed higher values than Vitrebond™ Plus (p < 0.05). The performance of Vitrebond™ had greater results for degree of conversion than Vitrebond™ Plus. The correlation between hardness and degree of conversion was no evidence in this study.
authors.affiliation: Department of Restorative Dentistry, University of São Paulo State, Araraquara School of Dentistry, Araraquara, São Paulo, Brazil.
authors.forename: Luiz Rafael
authors.initials: LR
authors.lastname: Calixto
authors.forename: Mateus Rodrigues
authors.initials: MR
authors.lastname: Tonetto
authors.forename: Shelon Cristina Souza
authors.initials: SC
authors.lastname: Pinto
authors.forename: Erico Damasceno
authors.initials: ED
authors.lastname: Barros
authors.forename: Alvaro Henrique
authors.initials: AH
authors.lastname: Borges
authors.forename: Fabricio Viana Pereira
authors.initials: FV
authors.lastname: Lima
authors.forename: Marcelo Ferrarezi
authors.initials: MF
authors.lastname: de Andrade
authors.forename: Matheus Coelho
authors.initials: MC
authors.lastname: Bandéca
mesh_terms: D002244:Carbon / Q000737:chemistry; D055117:Curing Lights, Dental / Q000145:classification*; D003799:Dental Stress Analysis / Q000295:instrumentation; D005899:Glass Ionomer Cements / Q000737:chemistry* / Q000528:radiation effects; D006244:Hardness; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation*; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D058105:Polymerization; D057872:Pulp Capping and Pulpectomy Agents / Q000737:chemistry; D011829:Radiation Dosage; D019279:Resin Cements / Q000737:chemistry / Q000528:radiation effects; D017550:Spectroscopy, Fourier Transform Infrared; D013314:Stress, Mechanical; D013997:Time Factors
chemical_list: D005899:Glass Ionomer Cements; D008689:Methacrylates; D057872:Pulp Capping and Pulpectomy Agents; D019279:Resin Cements; C541368:Vitrebond Plus; C067790:Vitrabond; D002244:Carbon; D010100:Oxygen